scholarly journals Orbit determination for standard-like maps: asymptotic expansion of the confidence region in regular zones

2020 ◽  
Vol 132 (8) ◽  
Author(s):  
Stefano Marò
2020 ◽  
Vol 132 (10) ◽  
Author(s):  
Alessio Del Vigna

AbstractWhen an asteroid has a few observations over a short time span the information contained in the observational arc could be so little that a full orbit determination may be not possible. One of the methods developed in recent years to overcome this problem is based on the systematic ranging and combined with the Admissible Region theory to constrain the poorly-determined topocentric range and range-rate. The result is a set of orbits compatible with the observations, the Manifold Of Variations, a two-dimensional compact manifold parametrised over the Admissible Region. Such a set of orbits represents the asteroid confidence region and is used for short-term hazard predictions. In this paper we present the Manifold Of Variations method and make a detailed analysis of the related probabilistic formalism.


2021 ◽  
Vol 133 (6) ◽  
Author(s):  
Stefano Marò ◽  
Claudio Bonanno

AbstractWe deal with the orbit determination problem for hyperbolic maps. The problem consists in determining the initial conditions of an orbit and, eventually, other parameters of the model from some observations. We study the behaviour of the confidence region in the case of simultaneous increase in the number of observations and the time span over which they are performed. More precisely, we describe the geometry of the confidence region for the solution, distinguishing whether a parameter is added to the estimate of the initial conditions or not. We prove that the inclusion of a dynamical parameter causes a change in the rate of decay of the uncertainties, as suggested by some known numerical evidences.


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